The Drag Force And Terminal Speed
A fluid is anything that can flow-generally either a gas or a liquid. When there is a relative velocity between a body (either because the body moves through the fluid or because the fluid moves past the body), the body experiences a drag force that opposes the relative motion and points in the direction in which the fluid flows relative to the body.
When a blunt body falls from rest through air, the drag force is directed upward; its magnitude gradually increases from zero as the speed of the body increases.
where m is the mass of the body. As suggested in if the body falls long enough, D eventually equals this means that a and so the body’s speed no longer increases.
However, if the cat does reach the acceleration vanishes and the cat relaxes somewhat, stretching its legs and neck horizontally outward and straightening its spine (it then resembles a flying squirrel).
Humans often fall from great heights for the fun of skydiving. However, in
April 1987, during a jump, sky diver Gregory Robertson noticed that fellow sky diver Debbie Williams had been knocked Unconscious in a collision with a third sky diver and was unable to open her parachute. Robertson, who was well above Williams at the time and who had not yet opened his parachute for the 4 km plunge.